无法使用XSSFWorkbook创建Spredsheet

Question

嗨，这是我使用XSSFWorkbook创建电子表格的代码：

import java.io.File;
import java.io.FileOutputStream;
import java.util.Map;
import java.util.Set;
import java.util.TreeMap;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
public class Writesheet 
{
   public static void main(String[] args) throws Exception 
   {
      //Create blank workbook
      XSSFWorkbook workbook = new XSSFWorkbook(); 
      //Create a blank sheet
      XSSFSheet spreadsheet = workbook.createSheet( 
      " Employee Info ");
      //Create row object
      XSSFRow row;
      //This data needs to be written (Object[])
      Map < String, Object[] > empinfo = 
      new TreeMap < String, Object[] >();
      empinfo.put( "1", new Object[] { 
      "EMP ID", "EMP NAME", "DESIGNATION" });
      empinfo.put( "2", new Object[] { 
      "tp01", "Gopal", "Technical Manager" });
      empinfo.put( "3", new Object[] { 
      "tp02", "Manisha", "Proof Reader" });
      empinfo.put( "4", new Object[] { 
      "tp03", "Masthan", "Technical Writer" });
      empinfo.put( "5", new Object[] { 
      "tp04", "Satish", "Technical Writer" });
      empinfo.put( "6", new Object[] { 
      "tp05", "Krishna", "Technical Writer" });
      //Iterate over data and write to sheet
      Set < String > keyid = empinfo.keySet();
      int rowid = 0;
      for (String key : keyid)
      {
         row = spreadsheet.createRow(rowid++);
         Object [] objectArr = empinfo.get(key);
         int cellid = 0;
         for (Object obj : objectArr)
         {
            Cell cell = row.createCell(cellid++);
            cell.setCellValue((String)obj);
         }
      }
      //Write the workbook in file system
      FileOutputStream out = new FileOutputStream( 
      new File("Writesheet.xlsx"));
      workbook.write(out);
      out.close();
      System.out.println( 
      "Writesheet.xlsx written successfully" );
   }
}

但是当我尝试运行它时，我得到以下ClassNotFound异常：

  

线程“main”中的异常java.lang.NoClassDefFoundError：   org / apache / xmlbeans / XmlException at   plotgz.XSSFParser.main（XSSFParser.java:17）引起：   java.lang.ClassNotFoundException：org.apache.xmlbeans.XmlException at   java.net.URLClassLoader $ 1.run（URLClassLoader.java:366）at   java.net.URLClassLoader $ 1.run（URLClassLoader.java:355）at   java.security.AccessController.doPrivileged（Native Method）at   java.net.URLClassLoader.findClass（URLClassLoader.java:354）at   java.lang.ClassLoader.loadClass（ClassLoader.java:425）at   sun.misc.Launcher $ AppClassLoader.loadClass（Launcher.java:308）at at   java.lang.ClassLoader.loadClass（ClassLoader.java:358）... 1更多

我在类路径中添加了以下jar：

  

POI-OOXML-3.5 beta5.jar

我无法弄清楚导致此异常的原因。任何帮助，将不胜感激。感谢。